<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        body {
            margin: 0;
        }

        .wrap {
            margin: 0 auto;
            width: 80%;
        }

        #left {
            width: 200px;
            height: 500px;
            background: #ccffff;
            float: left;
        }

        #right {
            width: 200px;
            height: 500px;
            background: #ccffff;
            float: right;
        }

        #main {
            height: 500px;
            background: #ffcccc;
            margin: 0 200px;
        }
    </style>
</head>
<body>
<div class="wrap">
    <aside id="left"></aside>
    <aside id="right"></aside>
    <section id="main"></section>
</div>
</body>
</html>